서지주요정보
Effect of heat-treatment on delayed hydride cracking in Zr-2.5wt%Nb pressure tube material = 열처리가 Zr-2.5wt%Nb 압력관 재료의 지체균열전파에 미치는 영향
서명 / 저자 Effect of heat-treatment on delayed hydride cracking in Zr-2.5wt%Nb pressure tube material = 열처리가 Zr-2.5wt%Nb 압력관 재료의 지체균열전파에 미치는 영향 / Je-Yong Oh.
저자명 Oh, Je-Yong ; 오제용
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8006143

소장위치/청구기호

학술문화관(문화관) 보존서고

MNE 96013

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초록정보

The mechanical properties, microstructure, and texture of Zr-2.5wt% Nb pressure tube material were changed by annealing, α+β, or β heat-treatment. After the specimens were hydrided to 100ppm, the morphology of hydrides was observed with optical microscope. The crack extension during delayed hydride cracking (DHC) test was measured with direct current potential drop method. After DHC test, fracture surfaces were observed with optical and scanning electron microscope. The hydrides in annealed specimens had similar morphology which was aligned to circumferential direction due to residual compressive stress introduced during manufacturing. However, α+β, or β heat-treated specimens had the random hydrides because residual compressive stress was eliminated by the heat-treatment. Specially for β-quenched specimen, thin and short hydrides were precipitated in martensite structure. Because of such a difference in hydride morphology, secondary crackings appeared in annealed specimens but not in the β-quenched specimen. Striation spacing was about 30~40㎛ and wider in the region where crack velocity depended on $K_I$. The striation spacing was tend to decrease with $K_I$ increase. The activation energy of DHC was 34kJ which was comparable to Coleman's result. As yield stress decreased, $K_{IH}$ increased while crack velocity decreased. Semi-empirical DHC model was proposed to describe the relationship between $K_I$ and crack velocity. The calculated crack velocity was proved to be comparable to measured one. Thus crack velocity can be predicted by the proposed DHC model if the material has similar texture to the current pressure tube material.

서지기타정보

서지기타정보
청구기호 {MNE 96013
형태사항 iv, 52 p. : 삽도 ; 26 cm
언어 영어
일반주기 저자명의 한글표기 : 오제용
지도교수의 영문표기 : In-Sup Kim
지도교수의 한글표기 : 김인섭
학위논문 학위논문(석사) - 한국과학기술원 : 원자력공학과,
서지주기 Reference : p. 27-28
주제 DHC
Pressure Tube
CANDU
Zirconium Alloy
지체균열전파
압력관
지르코늄 합금
QR CODE qr code